Finding the Fourth Proportional to 9,085.80, 12,538.80 and 5,106.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,085.80 : 12,538.80 = 5,106.72 : x
2. Step 2: Convert to fraction form
   9,085.80/12,538.80 = 5,106.72/x
3. Step 3: Cross multiply
   9,085.80x = 12,538.80 × 5,106.72
4. Step 4: Simplify right side
   9,085.80x = 64,032,140.74
5. Step 5: Solve for x
   x = 64,032,140.74/9,085.80
6. Step 6: Final answer
   x = 7,047.50