Finding the Fourth Proportional to 9,139.44, 12,611.52 and 5,160

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.44 : 12,611.52 = 5,160 : x
2. Step 2: Convert to fraction form
   9,139.44/12,611.52 = 5,160/x
3. Step 3: Cross multiply
   9,139.44x = 12,611.52 × 5,160
4. Step 4: Simplify right side
   9,139.44x = 65,075,443.20
5. Step 5: Solve for x
   x = 65,075,443.20/9,139.44
6. Step 6: Final answer
   x = 7,120.29