Finding the Fourth Proportional to 11,139.32, 15,373.59 and 6,423.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,139.32 : 15,373.59 = 6,423.50 : x
2. Step 2: Convert to fraction form
   11,139.32/15,373.59 = 6,423.50/x
3. Step 3: Cross multiply
   11,139.32x = 15,373.59 × 6,423.50
4. Step 4: Simplify right side
   11,139.32x = 98,752,255.37
5. Step 5: Solve for x
   x = 98,752,255.37/11,139.32
6. Step 6: Final answer
   x = 8,865.20