Finding the Fourth Proportional to 128,853, 177,836.58 and 78,581.16

Step by Step Solution

1. Step 1: Write the proportion equation
   128,853 : 177,836.58 = 78,581.16 : x
2. Step 2: Convert to fraction form
   128,853/177,836.58 = 78,581.16/x
3. Step 3: Cross multiply
   128,853x = 177,836.58 × 78,581.16
4. Step 4: Simplify right side
   128,853x = 13,974,604,746.83
5. Step 5: Solve for x
   x = 13,974,604,746.83/128,853
6. Step 6: Final answer
   x = 108,453.86