Finding the Fourth Proportional to 4,663.78, 6,440.72 and 2,985.86

Step by Step Solution

1. Step 1: Write the proportion equation
   4,663.78 : 6,440.72 = 2,985.86 : x
2. Step 2: Convert to fraction form
   4,663.78/6,440.72 = 2,985.86/x
3. Step 3: Cross multiply
   4,663.78x = 6,440.72 × 2,985.86
4. Step 4: Simplify right side
   4,663.78x = 19,231,089.39
5. Step 5: Solve for x
   x = 19,231,089.39/4,663.78
6. Step 6: Final answer
   x = 4,123.50