Finding the Fourth Proportional to 138,942, 208,692.72 and 82,891.62

Step by Step Solution

1. Step 1: Write the proportion equation
   138,942 : 208,692.72 = 82,891.62 : x
2. Step 2: Convert to fraction form
   138,942/208,692.72 = 82,891.62/x
3. Step 3: Cross multiply
   138,942x = 208,692.72 × 82,891.62
4. Step 4: Simplify right side
   138,942x = 17,298,877,643.01
5. Step 5: Solve for x
   x = 17,298,877,643.01/138,942
6. Step 6: Final answer
   x = 124,504.31