Finding the Fourth Proportional to 64,978.47, 89,670.71 and 38,121.57

Step by Step Solution

1. Step 1: Write the proportion equation
   64,978.47 : 89,670.71 = 38,121.57 : x
2. Step 2: Convert to fraction form
   64,978.47/89,670.71 = 38,121.57/x
3. Step 3: Cross multiply
   64,978.47x = 89,670.71 × 38,121.57
4. Step 4: Simplify right side
   64,978.47x = 3,418,388,343.52
5. Step 5: Solve for x
   x = 3,418,388,343.52/64,978.47
6. Step 6: Final answer
   x = 52,608.02