Finding the Fourth Proportional to 10,918.85, 15,111.32 and 10,656.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,918.85 : 15,111.32 = 10,656.78 : x
2. Step 2: Convert to fraction form
   10,918.85/15,111.32 = 10,656.78/x
3. Step 3: Cross multiply
   10,918.85x = 15,111.32 × 10,656.78
4. Step 4: Simplify right side
   10,918.85x = 161,037,959.47
5. Step 5: Solve for x
   x = 161,037,959.47/10,918.85
6. Step 6: Final answer
   x = 14,748.63