Finding the Fourth Proportional to 389,002.33, 536,832.71 and 216,918.61

Step by Step Solution

1. Step 1: Write the proportion equation
   389,002.33 : 536,832.71 = 216,918.61 : x
2. Step 2: Convert to fraction form
   389,002.33/536,832.71 = 216,918.61/x
3. Step 3: Cross multiply
   389,002.33x = 536,832.71 × 216,918.61
4. Step 4: Simplify right side
   389,002.33x = 116,449,005,513.22
5. Step 5: Solve for x
   x = 116,449,005,513.22/389,002.33
6. Step 6: Final answer
   x = 299,352.98