Finding the Fourth Proportional to 1,013.76, 1,521.18 and 436.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.76 : 1,521.18 = 436.50 : x
2. Step 2: Convert to fraction form
   1,013.76/1,521.18 = 436.50/x
3. Step 3: Cross multiply
   1,013.76x = 1,521.18 × 436.50
4. Step 4: Simplify right side
   1,013.76x = 663,995.07
5. Step 5: Solve for x
   x = 663,995.07/1,013.76
6. Step 6: Final answer
   x = 654.98