Finding the Fourth Proportional to 10,870.14, 15,000.18 and 7,889.76

Step by Step Solution

1. Step 1: Write the proportion equation
   10,870.14 : 15,000.18 = 7,889.76 : x
2. Step 2: Convert to fraction form
   10,870.14/15,000.18 = 7,889.76/x
3. Step 3: Cross multiply
   10,870.14x = 15,000.18 × 7,889.76
4. Step 4: Simplify right side
   10,870.14x = 118,347,820.16
5. Step 5: Solve for x
   x = 118,347,820.16/10,870.14
6. Step 6: Final answer
   x = 10,887.42