Finding the Fourth Proportional to 9,109.31, 12,570.67 and 5,130.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.31 : 12,570.67 = 5,130.42 : x
2. Step 2: Convert to fraction form
   9,109.31/12,570.67 = 5,130.42/x
3. Step 3: Cross multiply
   9,109.31x = 12,570.67 × 5,130.42
4. Step 4: Simplify right side
   9,109.31x = 64,492,829.36
5. Step 5: Solve for x
   x = 64,492,829.36/9,109.31
6. Step 6: Final answer
   x = 7,079.88