Finding the Fourth Proportional to 10,875.80, 16,308.12 and 5,320.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,875.80 : 16,308.12 = 5,320.76 : x
2. Step 2: Convert to fraction form
   10,875.80/16,308.12 = 5,320.76/x
3. Step 3: Cross multiply
   10,875.80x = 16,308.12 × 5,320.76
4. Step 4: Simplify right side
   10,875.80x = 86,771,592.57
5. Step 5: Solve for x
   x = 86,771,592.57/10,875.80
6. Step 6: Final answer
   x = 7,978.41