Finding the Fourth Proportional to 216,646,288.12, 298,971,877.61 and 123,828,788.89

Step by Step Solution

1. Step 1: Write the proportion equation
   216,646,288.12 : 298,971,877.61 = 123,828,788.89 : x
2. Step 2: Convert to fraction form
   216,646,288.12/298,971,877.61 = 123,828,788.89/x
3. Step 3: Cross multiply
   216,646,288.12x = 298,971,877.61 × 123,828,788.89
4. Step 4: Simplify right side
   216,646,288.12x = 37,021,325,514,501,608
5. Step 5: Solve for x
   x = 37,021,325,514,501,608/216,646,288.12
6. Step 6: Final answer
   x = 170,883,728.66