Finding the Fourth Proportional to 22,538.59, 31,128.78 and 15,356.05

Step by Step Solution

1. Step 1: Write the proportion equation
   22,538.59 : 31,128.78 = 15,356.05 : x
2. Step 2: Convert to fraction form
   22,538.59/31,128.78 = 15,356.05/x
3. Step 3: Cross multiply
   22,538.59x = 31,128.78 × 15,356.05
4. Step 4: Simplify right side
   22,538.59x = 478,015,081.88
5. Step 5: Solve for x
   x = 478,015,081.88/22,538.59
6. Step 6: Final answer
   x = 21,208.74