Finding the Fourth Proportional to 96,978.72, 133,836.12 and 64,657.56

Step by Step Solution

1. Step 1: Write the proportion equation
   96,978.72 : 133,836.12 = 64,657.56 : x
2. Step 2: Convert to fraction form
   96,978.72/133,836.12 = 64,657.56/x
3. Step 3: Cross multiply
   96,978.72x = 133,836.12 × 64,657.56
4. Step 4: Simplify right side
   96,978.72x = 8,653,516,959.07
5. Step 5: Solve for x
   x = 8,653,516,959.07/96,978.72
6. Step 6: Final answer
   x = 89,231.09