Finding the Fourth Proportional to 215,064.09, 322,720.61 and 88,680.78

Step by Step Solution

1. Step 1: Write the proportion equation
   215,064.09 : 322,720.61 = 88,680.78 : x
2. Step 2: Convert to fraction form
   215,064.09/322,720.61 = 88,680.78/x
3. Step 3: Cross multiply
   215,064.09x = 322,720.61 × 88,680.78
4. Step 4: Simplify right side
   215,064.09x = 28,619,114,973.47
5. Step 5: Solve for x
   x = 28,619,114,973.47/215,064.09
6. Step 6: Final answer
   x = 133,072.49