Finding the Fourth Proportional to 62,619.72, 86,428.25 and 57,575.95

Step by Step Solution

1. Step 1: Write the proportion equation
   62,619.72 : 86,428.25 = 57,575.95 : x
2. Step 2: Convert to fraction form
   62,619.72/86,428.25 = 57,575.95/x
3. Step 3: Cross multiply
   62,619.72x = 86,428.25 × 57,575.95
4. Step 4: Simplify right side
   62,619.72x = 4,976,188,312.55
5. Step 5: Solve for x
   x = 4,976,188,312.55/62,619.72
6. Step 6: Final answer
   x = 79,466.80