Finding the Fourth Proportional to 1,015.37, 1,521.83 and 430.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,015.37 : 1,521.83 = 430.15 : x
2. Step 2: Convert to fraction form
   1,015.37/1,521.83 = 430.15/x
3. Step 3: Cross multiply
   1,015.37x = 1,521.83 × 430.15
4. Step 4: Simplify right side
   1,015.37x = 654,605.41
5. Step 5: Solve for x
   x = 654,605.41/1,015.37
6. Step 6: Final answer
   x = 644.70