Finding the Fourth Proportional to 208,196.32, 287,312.90 and 122,156.77

Step by Step Solution

1. Step 1: Write the proportion equation
   208,196.32 : 287,312.90 = 122,156.77 : x
2. Step 2: Convert to fraction form
   208,196.32/287,312.90 = 122,156.77/x
3. Step 3: Cross multiply
   208,196.32x = 287,312.90 × 122,156.77
4. Step 4: Simplify right side
   208,196.32x = 35,097,215,275.61
5. Step 5: Solve for x
   x = 35,097,215,275.61/208,196.32
6. Step 6: Final answer
   x = 168,577.50