Finding the Fourth Proportional to 385,245.56, 531,610.00 and 215,446.88

Step by Step Solution

1. Step 1: Write the proportion equation
   385,245.56 : 531,610.00 = 215,446.88 : x
2. Step 2: Convert to fraction form
   385,245.56/531,610.00 = 215,446.88/x
3. Step 3: Cross multiply
   385,245.56x = 531,610.00 × 215,446.88
4. Step 4: Simplify right side
   385,245.56x = 114,533,712,141.52
5. Step 5: Solve for x
   x = 114,533,712,141.52/385,245.56
6. Step 6: Final answer
   x = 297,300.54