Finding the Fourth Proportional to 139,139.53, 192,012.61 and 78,708.88

Step by Step Solution

1. Step 1: Write the proportion equation
   139,139.53 : 192,012.61 = 78,708.88 : x
2. Step 2: Convert to fraction form
   139,139.53/192,012.61 = 78,708.88/x
3. Step 3: Cross multiply
   139,139.53x = 192,012.61 × 78,708.88
4. Step 4: Simplify right side
   139,139.53x = 15,113,096,802.17
5. Step 5: Solve for x
   x = 15,113,096,802.17/139,139.53
6. Step 6: Final answer
   x = 108,618.28