Finding the Fourth Proportional to 64,754.88, 89,363.28 and 42,398.88

Step by Step Solution

1. Step 1: Write the proportion equation
   64,754.88 : 89,363.28 = 42,398.88 : x
2. Step 2: Convert to fraction form
   64,754.88/89,363.28 = 42,398.88/x
3. Step 3: Cross multiply
   64,754.88x = 89,363.28 × 42,398.88
4. Step 4: Simplify right side
   64,754.88x = 3,788,902,985.13
5. Step 5: Solve for x
   x = 3,788,902,985.13/64,754.88
6. Step 6: Final answer
   x = 58,511.47