Finding the Fourth Proportional to 559,870.68, 839,805.57 and 139,146.56

Step by Step Solution

1. Step 1: Write the proportion equation
   559,870.68 : 839,805.57 = 139,146.56 : x
2. Step 2: Convert to fraction form
   559,870.68/839,805.57 = 139,146.56/x
3. Step 3: Cross multiply
   559,870.68x = 839,805.57 × 139,146.56
4. Step 4: Simplify right side
   559,870.68x = 116,856,055,084.58
5. Step 5: Solve for x
   x = 116,856,055,084.58/559,870.68
6. Step 6: Final answer
   x = 208,719.72