Finding the Fourth Proportional to 143,783, 198,417.87 and 78,372.38

Step by Step Solution

1. Step 1: Write the proportion equation
   143,783 : 198,417.87 = 78,372.38 : x
2. Step 2: Convert to fraction form
   143,783/198,417.87 = 78,372.38/x
3. Step 3: Cross multiply
   143,783x = 198,417.87 × 78,372.38
4. Step 4: Simplify right side
   143,783x = 15,550,480,706.43
5. Step 5: Solve for x
   x = 15,550,480,706.43/143,783
6. Step 6: Final answer
   x = 108,152.43