Finding the Fourth Proportional to 616,900.77, 925,124.50 and 211,978.15

Step by Step Solution

1. Step 1: Write the proportion equation
   616,900.77 : 925,124.50 = 211,978.15 : x
2. Step 2: Convert to fraction form
   616,900.77/925,124.50 = 211,978.15/x
3. Step 3: Cross multiply
   616,900.77x = 925,124.50 × 211,978.15
4. Step 4: Simplify right side
   616,900.77x = 196,106,174,344.16
5. Step 5: Solve for x
   x = 196,106,174,344.16/616,900.77
6. Step 6: Final answer
   x = 317,889.33