Finding the Fourth Proportional to 128,849, 177,831.06 and 78,577.16

Step by Step Solution

1. Step 1: Write the proportion equation
   128,849 : 177,831.06 = 78,577.16 : x
2. Step 2: Convert to fraction form
   128,849/177,831.06 = 78,577.16/x
3. Step 3: Cross multiply
   128,849x = 177,831.06 × 78,577.16
4. Step 4: Simplify right side
   128,849x = 13,973,459,654.59
5. Step 5: Solve for x
   x = 13,973,459,654.59/128,849
6. Step 6: Final answer
   x = 108,448.34