Finding the Fourth Proportional to 208,113.50, 287,196.63 and 112,620.20

Step by Step Solution

1. Step 1: Write the proportion equation
   208,113.50 : 287,196.63 = 112,620.20 : x
2. Step 2: Convert to fraction form
   208,113.50/287,196.63 = 112,620.20/x
3. Step 3: Cross multiply
   208,113.50x = 287,196.63 × 112,620.20
4. Step 4: Simplify right side
   208,113.50x = 32,344,141,223.60
5. Step 5: Solve for x
   x = 32,344,141,223.60/208,113.50
6. Step 6: Final answer
   x = 155,415.87