Finding the Fourth Proportional to 64,691.20, 89,272.32 and 42,334.72

Step by Step Solution

1. Step 1: Write the proportion equation
   64,691.20 : 89,272.32 = 42,334.72 : x
2. Step 2: Convert to fraction form
   64,691.20/89,272.32 = 42,334.72/x
3. Step 3: Cross multiply
   64,691.20x = 89,272.32 × 42,334.72
4. Step 4: Simplify right side
   64,691.20x = 3,779,318,670.95
5. Step 5: Solve for x
   x = 3,779,318,670.95/64,691.20
6. Step 6: Final answer
   x = 58,420.91