Finding the Fourth Proportional to 143,591.81, 215,387.78 and 64,613.78

Step by Step Solution

1. Step 1: Write the proportion equation
   143,591.81 : 215,387.78 = 64,613.78 : x
2. Step 2: Convert to fraction form
   143,591.81/215,387.78 = 64,613.78/x
3. Step 3: Cross multiply
   143,591.81x = 215,387.78 × 64,613.78
4. Step 4: Simplify right side
   143,591.81x = 13,917,018,308.54
5. Step 5: Solve for x
   x = 13,917,018,308.54/143,591.81
6. Step 6: Final answer
   x = 96,920.70