Finding the Fourth Proportional to 138,942.82, 191,784.69 and 88,641.78

Step by Step Solution

1. Step 1: Write the proportion equation
   138,942.82 : 191,784.69 = 88,641.78 : x
2. Step 2: Convert to fraction form
   138,942.82/191,784.69 = 88,641.78/x
3. Step 3: Cross multiply
   138,942.82x = 191,784.69 × 88,641.78
4. Step 4: Simplify right side
   138,942.82x = 17,000,136,298.35
5. Step 5: Solve for x
   x = 17,000,136,298.35/138,942.82
6. Step 6: Final answer
   x = 122,353.47