Finding the Fourth Proportional to 22,784.31, 31,442.27 and 12,712.19

Step by Step Solution

1. Step 1: Write the proportion equation
   22,784.31 : 31,442.27 = 12,712.19 : x
2. Step 2: Convert to fraction form
   22,784.31/31,442.27 = 12,712.19/x
3. Step 3: Cross multiply
   22,784.31x = 31,442.27 × 12,712.19
4. Step 4: Simplify right side
   22,784.31x = 399,699,889.50
5. Step 5: Solve for x
   x = 399,699,889.50/22,784.31
6. Step 6: Final answer
   x = 17,542.77