Finding the Fourth Proportional to 476,888.74, 715,443.89 and 139,915.78

Step by Step Solution

1. Step 1: Write the proportion equation
   476,888.74 : 715,443.89 = 139,915.78 : x
2. Step 2: Convert to fraction form
   476,888.74/715,443.89 = 139,915.78/x
3. Step 3: Cross multiply
   476,888.74x = 715,443.89 × 139,915.78
4. Step 4: Simplify right side
   476,888.74x = 100,101,889,915.58
5. Step 5: Solve for x
   x = 100,101,889,915.58/476,888.74
6. Step 6: Final answer
   x = 209,906.17