Finding the Fourth Proportional to 138,368.72, 190,949.96 and 78,756.56

Step by Step Solution

1. Step 1: Write the proportion equation
   138,368.72 : 190,949.96 = 78,756.56 : x
2. Step 2: Convert to fraction form
   138,368.72/190,949.96 = 78,756.56/x
3. Step 3: Cross multiply
   138,368.72x = 190,949.96 × 78,756.56
4. Step 4: Simplify right side
   138,368.72x = 15,038,561,981.74
5. Step 5: Solve for x
   x = 15,038,561,981.74/138,368.72
6. Step 6: Final answer
   x = 108,684.69