Finding the Fourth Proportional to 12,611.57, 17,403.72 and 7,898.45

Step by Step Solution

1. Step 1: Write the proportion equation
   12,611.57 : 17,403.72 = 7,898.45 : x
2. Step 2: Convert to fraction form
   12,611.57/17,403.72 = 7,898.45/x
3. Step 3: Cross multiply
   12,611.57x = 17,403.72 × 7,898.45
4. Step 4: Simplify right side
   12,611.57x = 137,462,426.12
5. Step 5: Solve for x
   x = 137,462,426.12/12,611.57
6. Step 6: Final answer
   x = 10,899.71