Finding the Fourth Proportional to 13,470, 18,588.72 and 7,881.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,470 : 18,588.72 = 7,881.12 : x
2. Step 2: Convert to fraction form
   13,470/18,588.72 = 7,881.12/x
3. Step 3: Cross multiply
   13,470x = 18,588.72 × 7,881.12
4. Step 4: Simplify right side
   13,470x = 146,499,932.97
5. Step 5: Solve for x
   x = 146,499,932.97/13,470
6. Step 6: Final answer
   x = 10,876.02