Finding the Fourth Proportional to 100,222.09, 138,308.72 and 57,200.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,222.09 : 138,308.72 = 57,200.72 : x
2. Step 2: Convert to fraction form
   100,222.09/138,308.72 = 57,200.72/x
3. Step 3: Cross multiply
   100,222.09x = 138,308.72 × 57,200.72
4. Step 4: Simplify right side
   100,222.09x = 7,911,358,366.28
5. Step 5: Solve for x
   x = 7,911,358,366.28/100,222.09
6. Step 6: Final answer
   x = 78,938.27