Finding the Fourth Proportional to 10,693.55, 16,009.95 and 10,111.70

Step by Step Solution

1. Step 1: Write the proportion equation
   10,693.55 : 16,009.95 = 10,111.70 : x
2. Step 2: Convert to fraction form
   10,693.55/16,009.95 = 10,111.70/x
3. Step 3: Cross multiply
   10,693.55x = 16,009.95 × 10,111.70
4. Step 4: Simplify right side
   10,693.55x = 161,887,811.42
5. Step 5: Solve for x
   x = 161,887,811.42/10,693.55
6. Step 6: Final answer
   x = 15,138.83