Finding the Fourth Proportional to 12,615.40, 18,920.06 and 5,591.52

Step by Step Solution

1. Step 1: Write the proportion equation
   12,615.40 : 18,920.06 = 5,591.52 : x
2. Step 2: Convert to fraction form
   12,615.40/18,920.06 = 5,591.52/x
3. Step 3: Cross multiply
   12,615.40x = 18,920.06 × 5,591.52
4. Step 4: Simplify right side
   12,615.40x = 105,791,893.89
5. Step 5: Solve for x
   x = 105,791,893.89/12,615.40
6. Step 6: Final answer
   x = 8,385.93