Finding the Fourth Proportional to 72,139.68, 99,514.98 and 45,231.48

Step by Step Solution

1. Step 1: Write the proportion equation
   72,139.68 : 99,514.98 = 45,231.48 : x
2. Step 2: Convert to fraction form
   72,139.68/99,514.98 = 45,231.48/x
3. Step 3: Cross multiply
   72,139.68x = 99,514.98 × 45,231.48
4. Step 4: Simplify right side
   72,139.68x = 4,501,209,827.57
5. Step 5: Solve for x
   x = 4,501,209,827.57/72,139.68
6. Step 6: Final answer
   x = 62,395.76