Finding the Fourth Proportional to 10,384.55, 15,563.86 and 5,191.91

Step by Step Solution

1. Step 1: Write the proportion equation
   10,384.55 : 15,563.86 = 5,191.91 : x
2. Step 2: Convert to fraction form
   10,384.55/15,563.86 = 5,191.91/x
3. Step 3: Cross multiply
   10,384.55x = 15,563.86 × 5,191.91
4. Step 4: Simplify right side
   10,384.55x = 80,806,069.57
5. Step 5: Solve for x
   x = 80,806,069.57/10,384.55
6. Step 6: Final answer
   x = 7,781.38