Finding the Fourth Proportional to 81,014.72, 121,521.72 and 21,856.38

Step by Step Solution

1. Step 1: Write the proportion equation
   81,014.72 : 121,521.72 = 21,856.38 : x
2. Step 2: Convert to fraction form
   81,014.72/121,521.72 = 21,856.38/x
3. Step 3: Cross multiply
   81,014.72x = 121,521.72 × 21,856.38
4. Step 4: Simplify right side
   81,014.72x = 2,656,024,890.57
5. Step 5: Solve for x
   x = 2,656,024,890.57/81,014.72
6. Step 6: Final answer
   x = 32,784.47