Finding the Fourth Proportional to 208,506, 287,738.12 and 113,012.72

Step by Step Solution

1. Step 1: Write the proportion equation
   208,506 : 287,738.12 = 113,012.72 : x
2. Step 2: Convert to fraction form
   208,506/287,738.12 = 113,012.72/x
3. Step 3: Cross multiply
   208,506x = 287,738.12 × 113,012.72
4. Step 4: Simplify right side
   208,506x = 32,518,067,588.89
5. Step 5: Solve for x
   x = 32,518,067,588.89/208,506
6. Step 6: Final answer
   x = 155,957.47