Finding the Fourth Proportional to 42,828,598.47, 64,245,389.67 and 12,120,608.91

Step by Step Solution

1. Step 1: Write the proportion equation
   42,828,598.47 : 64,245,389.67 = 12,120,608.91 : x
2. Step 2: Convert to fraction form
   42,828,598.47/64,245,389.67 = 12,120,608.91/x
3. Step 3: Cross multiply
   42,828,598.47x = 64,245,389.67 × 12,120,608.91
4. Step 4: Simplify right side
   42,828,598.47x = 778,693,242,460,624
5. Step 5: Solve for x
   x = 778,693,242,460,624/42,828,598.47
6. Step 6: Final answer
   x = 18,181,618.60