Finding the Fourth Proportional to 1,247.54, 1,870.23 and 477.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,247.54 : 1,870.23 = 477.50 : x
2. Step 2: Convert to fraction form
   1,247.54/1,870.23 = 477.50/x
3. Step 3: Cross multiply
   1,247.54x = 1,870.23 × 477.50
4. Step 4: Simplify right side
   1,247.54x = 893,034.83
5. Step 5: Solve for x
   x = 893,034.83/1,247.54
6. Step 6: Final answer
   x = 715.84