Finding the Fourth Proportional to 143,870.10, 215,513.55 and 81,467.70

Step by Step Solution

1. Step 1: Write the proportion equation
   143,870.10 : 215,513.55 = 81,467.70 : x
2. Step 2: Convert to fraction form
   143,870.10/215,513.55 = 81,467.70/x
3. Step 3: Cross multiply
   143,870.10x = 215,513.55 × 81,467.70
4. Step 4: Simplify right side
   143,870.10x = 17,557,393,237.34
5. Step 5: Solve for x
   x = 17,557,393,237.34/143,870.10
6. Step 6: Final answer
   x = 122,036.43