Finding the Fourth Proportional to 136,978.88, 205,494.24 and 77,881.28

Step by Step Solution

1. Step 1: Write the proportion equation
   136,978.88 : 205,494.24 = 77,881.28 : x
2. Step 2: Convert to fraction form
   136,978.88/205,494.24 = 77,881.28/x
3. Step 3: Cross multiply
   136,978.88x = 205,494.24 × 77,881.28
4. Step 4: Simplify right side
   136,978.88x = 16,004,154,443.83
5. Step 5: Solve for x
   x = 16,004,154,443.83/136,978.88
6. Step 6: Final answer
   x = 116,836.66