Finding the Fourth Proportional to 138,165, 190,667.70 and 78,549

Step by Step Solution

1. Step 1: Write the proportion equation
   138,165 : 190,667.70 = 78,549 : x
2. Step 2: Convert to fraction form
   138,165/190,667.70 = 78,549/x
3. Step 3: Cross multiply
   138,165x = 190,667.70 × 78,549
4. Step 4: Simplify right side
   138,165x = 14,976,757,167.30
5. Step 5: Solve for x
   x = 14,976,757,167.30/138,165
6. Step 6: Final answer
   x = 108,397.62