Finding the Fourth Proportional to 143,643.30, 215,562.15 and 64,716.90

Step by Step Solution

1. Step 1: Write the proportion equation
   143,643.30 : 215,562.15 = 64,716.90 : x
2. Step 2: Convert to fraction form
   143,643.30/215,562.15 = 64,716.90/x
3. Step 3: Cross multiply
   143,643.30x = 215,562.15 × 64,716.90
4. Step 4: Simplify right side
   143,643.30x = 13,950,514,105.34
5. Step 5: Solve for x
   x = 13,950,514,105.34/143,643.30
6. Step 6: Final answer
   x = 97,119.14