Finding the Fourth Proportional to 22,742.31, 31,384.18 and 12,670.57

Step by Step Solution

1. Step 1: Write the proportion equation
   22,742.31 : 31,384.18 = 12,670.57 : x
2. Step 2: Convert to fraction form
   22,742.31/31,384.18 = 12,670.57/x
3. Step 3: Cross multiply
   22,742.31x = 31,384.18 × 12,670.57
4. Step 4: Simplify right side
   22,742.31x = 397,655,339.45
5. Step 5: Solve for x
   x = 397,655,339.45/22,742.31
6. Step 6: Final answer
   x = 17,485.27