Finding the Fourth Proportional to 1,518.72, 2,277.72 and 423.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,518.72 : 2,277.72 = 423.12 : x
2. Step 2: Convert to fraction form
   1,518.72/2,277.72 = 423.12/x
3. Step 3: Cross multiply
   1,518.72x = 2,277.72 × 423.12
4. Step 4: Simplify right side
   1,518.72x = 963,748.89
5. Step 5: Solve for x
   x = 963,748.89/1,518.72
6. Step 6: Final answer
   x = 634.58