Finding the Fourth Proportional to 143,521.94, 198,053.52 and 78,989.06

Step by Step Solution

1. Step 1: Write the proportion equation
   143,521.94 : 198,053.52 = 78,989.06 : x
2. Step 2: Convert to fraction form
   143,521.94/198,053.52 = 78,989.06/x
3. Step 3: Cross multiply
   143,521.94x = 198,053.52 × 78,989.06
4. Step 4: Simplify right side
   143,521.94x = 15,644,061,374.49
5. Step 5: Solve for x
   x = 15,644,061,374.49/143,521.94
6. Step 6: Final answer
   x = 109,001.18