Finding the Fourth Proportional to 1,477.98, 2,217.78 and 612.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,477.98 : 2,217.78 = 612.50 : x
2. Step 2: Convert to fraction form
   1,477.98/2,217.78 = 612.50/x
3. Step 3: Cross multiply
   1,477.98x = 2,217.78 × 612.50
4. Step 4: Simplify right side
   1,477.98x = 1,358,379.16
5. Step 5: Solve for x
   x = 1,358,379.16/1,477.98
6. Step 6: Final answer
   x = 919.08