Finding the Fourth Proportional to 1,477.45, 2,215.45 and 861.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,477.45 : 2,215.45 = 861.37 : x
2. Step 2: Convert to fraction form
   1,477.45/2,215.45 = 861.37/x
3. Step 3: Cross multiply
   1,477.45x = 2,215.45 × 861.37
4. Step 4: Simplify right side
   1,477.45x = 1,908,322.17
5. Step 5: Solve for x
   x = 1,908,322.17/1,477.45
6. Step 6: Final answer
   x = 1,291.63