Finding the Fourth Proportional to 10,123.86, 13,955.68 and 7,881.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,123.86 : 13,955.68 = 7,881.78 : x
2. Step 2: Convert to fraction form
   10,123.86/13,955.68 = 7,881.78/x
3. Step 3: Cross multiply
   10,123.86x = 13,955.68 × 7,881.78
4. Step 4: Simplify right side
   10,123.86x = 109,995,599.51
5. Step 5: Solve for x
   x = 109,995,599.51/10,123.86
6. Step 6: Final answer
   x = 10,864.99