Finding the Fourth Proportional to 208,221.78, 287,347.50 and 112,728.72

Step by Step Solution

1. Step 1: Write the proportion equation
   208,221.78 : 287,347.50 = 112,728.72 : x
2. Step 2: Convert to fraction form
   208,221.78/287,347.50 = 112,728.72/x
3. Step 3: Cross multiply
   208,221.78x = 287,347.50 × 112,728.72
4. Step 4: Simplify right side
   208,221.78x = 32,392,315,870.20
5. Step 5: Solve for x
   x = 32,392,315,870.20/208,221.78
6. Step 6: Final answer
   x = 155,566.42