Finding the Fourth Proportional to 11,385.56, 17,087.15 and 7,900.03

Step by Step Solution

1. Step 1: Write the proportion equation
   11,385.56 : 17,087.15 = 7,900.03 : x
2. Step 2: Convert to fraction form
   11,385.56/17,087.15 = 7,900.03/x
3. Step 3: Cross multiply
   11,385.56x = 17,087.15 × 7,900.03
4. Step 4: Simplify right side
   11,385.56x = 134,989,038.72
5. Step 5: Solve for x
   x = 134,989,038.72/11,385.56
6. Step 6: Final answer
   x = 11,856.16