Finding the Fourth Proportional to 98,978.79, 136,558.61 and 55,954.12

Step by Step Solution

1. Step 1: Write the proportion equation
   98,978.79 : 136,558.61 = 55,954.12 : x
2. Step 2: Convert to fraction form
   98,978.79/136,558.61 = 55,954.12/x
3. Step 3: Cross multiply
   98,978.79x = 136,558.61 × 55,954.12
4. Step 4: Simplify right side
   98,978.79x = 7,641,016,850.97
5. Step 5: Solve for x
   x = 7,641,016,850.97/98,978.79
6. Step 6: Final answer
   x = 77,198.53