Finding the Fourth Proportional to 28,371.72, 42,492.72 and 13,591.08

Step by Step Solution

1. Step 1: Write the proportion equation
   28,371.72 : 42,492.72 = 13,591.08 : x
2. Step 2: Convert to fraction form
   28,371.72/42,492.72 = 13,591.08/x
3. Step 3: Cross multiply
   28,371.72x = 42,492.72 × 13,591.08
4. Step 4: Simplify right side
   28,371.72x = 577,521,956.94
5. Step 5: Solve for x
   x = 577,521,956.94/28,371.72
6. Step 6: Final answer
   x = 20,355.55