Finding the Fourth Proportional to 5,405.76, 7,456.32 and 4,230.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,405.76 : 7,456.32 = 4,230.72 : x
2. Step 2: Convert to fraction form
   5,405.76/7,456.32 = 4,230.72/x
3. Step 3: Cross multiply
   5,405.76x = 7,456.32 × 4,230.72
4. Step 4: Simplify right side
   5,405.76x = 31,545,602.15
5. Step 5: Solve for x
   x = 31,545,602.15/5,405.76
6. Step 6: Final answer
   x = 5,835.55