Finding the Fourth Proportional to 65,342.32, 90,168.80 and 38,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   65,342.32 : 90,168.80 = 38,478.72 : x
2. Step 2: Convert to fraction form
   65,342.32/90,168.80 = 38,478.72/x
3. Step 3: Cross multiply
   65,342.32x = 90,168.80 × 38,478.72
4. Step 4: Simplify right side
   65,342.32x = 3,469,580,007.94
5. Step 5: Solve for x
   x = 3,469,580,007.94/65,342.32
6. Step 6: Final answer
   x = 53,098.51