Finding the Fourth Proportional to 22,619.64, 31,216.52 and 13,061.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,619.64 : 31,216.52 = 13,061.28 : x
2. Step 2: Convert to fraction form
   22,619.64/31,216.52 = 13,061.28/x
3. Step 3: Cross multiply
   22,619.64x = 31,216.52 × 13,061.28
4. Step 4: Simplify right side
   22,619.64x = 407,727,643.04
5. Step 5: Solve for x
   x = 407,727,643.04/22,619.64
6. Step 6: Final answer
   x = 18,025.38