Finding the Fourth Proportional to 77,025.50, 115,557.72 and 21,621.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,025.50 : 115,557.72 = 21,621.50 : x
2. Step 2: Convert to fraction form
   77,025.50/115,557.72 = 21,621.50/x
3. Step 3: Cross multiply
   77,025.50x = 115,557.72 × 21,621.50
4. Step 4: Simplify right side
   77,025.50x = 2,498,531,242.98
5. Step 5: Solve for x
   x = 2,498,531,242.98/77,025.50
6. Step 6: Final answer
   x = 32,437.72