Finding the Fourth Proportional to 385,585.33, 532,107.33 and 215,819.45

Step by Step Solution

1. Step 1: Write the proportion equation
   385,585.33 : 532,107.33 = 215,819.45 : x
2. Step 2: Convert to fraction form
   385,585.33/532,107.33 = 215,819.45/x
3. Step 3: Cross multiply
   385,585.33x = 532,107.33 × 215,819.45
4. Step 4: Simplify right side
   385,585.33x = 114,839,112,820.22
5. Step 5: Solve for x
   x = 114,839,112,820.22/385,585.33
6. Step 6: Final answer
   x = 297,830.61