Finding the Fourth Proportional to 15,980.31, 22,053.58 and 8,906.78

Step by Step Solution

1. Step 1: Write the proportion equation
   15,980.31 : 22,053.58 = 8,906.78 : x
2. Step 2: Convert to fraction form
   15,980.31/22,053.58 = 8,906.78/x
3. Step 3: Cross multiply
   15,980.31x = 22,053.58 × 8,906.78
4. Step 4: Simplify right side
   15,980.31x = 196,426,385.27
5. Step 5: Solve for x
   x = 196,426,385.27/15,980.31
6. Step 6: Final answer
   x = 12,291.78