Finding the Fourth Proportional to 9,109.32, 12,571.50 and 5,130.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.32 : 12,571.50 = 5,130.78 : x
2. Step 2: Convert to fraction form
   9,109.32/12,571.50 = 5,130.78/x
3. Step 3: Cross multiply
   9,109.32x = 12,571.50 × 5,130.78
4. Step 4: Simplify right side
   9,109.32x = 64,501,600.77
5. Step 5: Solve for x
   x = 64,501,600.77/9,109.32
6. Step 6: Final answer
   x = 7,080.84