Finding the Fourth Proportional to 71,608.68, 98,729.15 and 51,215.31

Step by Step Solution

1. Step 1: Write the proportion equation
   71,608.68 : 98,729.15 = 51,215.31 : x
2. Step 2: Convert to fraction form
   71,608.68/98,729.15 = 51,215.31/x
3. Step 3: Cross multiply
   71,608.68x = 98,729.15 × 51,215.31
4. Step 4: Simplify right side
   71,608.68x = 5,056,443,767.21
5. Step 5: Solve for x
   x = 5,056,443,767.21/71,608.68
6. Step 6: Final answer
   x = 70,612.16