Finding the Fourth Proportional to 64,734, 89,371.80 and 42,416.88

Step by Step Solution

1. Step 1: Write the proportion equation
   64,734 : 89,371.80 = 42,416.88 : x
2. Step 2: Convert to fraction form
   64,734/89,371.80 = 42,416.88/x
3. Step 3: Cross multiply
   64,734x = 89,371.80 × 42,416.88
4. Step 4: Simplify right side
   64,734x = 3,790,872,915.98
5. Step 5: Solve for x
   x = 3,790,872,915.98/64,734
6. Step 6: Final answer
   x = 58,560.77