Finding the Fourth Proportional to 76,821.50, 115,233.06 and 21,417.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,821.50 : 115,233.06 = 21,417.50 : x
2. Step 2: Convert to fraction form
   76,821.50/115,233.06 = 21,417.50/x
3. Step 3: Cross multiply
   76,821.50x = 115,233.06 × 21,417.50
4. Step 4: Simplify right side
   76,821.50x = 2,468,004,062.55
5. Step 5: Solve for x
   x = 2,468,004,062.55/76,821.50
6. Step 6: Final answer
   x = 32,126.48