Finding the Fourth Proportional to 98,002.76, 135,239.82 and 57,718.20

Step by Step Solution

1. Step 1: Write the proportion equation
   98,002.76 : 135,239.82 = 57,718.20 : x
2. Step 2: Convert to fraction form
   98,002.76/135,239.82 = 57,718.20/x
3. Step 3: Cross multiply
   98,002.76x = 135,239.82 × 57,718.20
4. Step 4: Simplify right side
   98,002.76x = 7,805,798,978.72
5. Step 5: Solve for x
   x = 7,805,798,978.72/98,002.76
6. Step 6: Final answer
   x = 79,648.77