Finding the Fourth Proportional to 212,100.72, 292,700.89 and 115,304.78

Step by Step Solution

1. Step 1: Write the proportion equation
   212,100.72 : 292,700.89 = 115,304.78 : x
2. Step 2: Convert to fraction form
   212,100.72/292,700.89 = 115,304.78/x
3. Step 3: Cross multiply
   212,100.72x = 292,700.89 × 115,304.78
4. Step 4: Simplify right side
   212,100.72x = 33,749,810,263.75
5. Step 5: Solve for x
   x = 33,749,810,263.75/212,100.72
6. Step 6: Final answer
   x = 159,121.62