Finding the Fourth Proportional to 10,900.31, 15,013.78 and 8,377.60

Step by Step Solution

1. Step 1: Write the proportion equation
   10,900.31 : 15,013.78 = 8,377.60 : x
2. Step 2: Convert to fraction form
   10,900.31/15,013.78 = 8,377.60/x
3. Step 3: Cross multiply
   10,900.31x = 15,013.78 × 8,377.60
4. Step 4: Simplify right side
   10,900.31x = 125,779,443.33
5. Step 5: Solve for x
   x = 125,779,443.33/10,900.31
6. Step 6: Final answer
   x = 11,539.07