Finding the Fourth Proportional to 77,076.50, 115,614.78 and 21,672.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,076.50 : 115,614.78 = 21,672.50 : x
2. Step 2: Convert to fraction form
   77,076.50/115,614.78 = 21,672.50/x
3. Step 3: Cross multiply
   77,076.50x = 115,614.78 × 21,672.50
4. Step 4: Simplify right side
   77,076.50x = 2,505,661,319.55
5. Step 5: Solve for x
   x = 2,505,661,319.55/77,076.50
6. Step 6: Final answer
   x = 32,508.76