Finding the Fourth Proportional to 1,077.89, 1,487.48 and 612.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.89 : 1,487.48 = 612.11 : x
2. Step 2: Convert to fraction form
   1,077.89/1,487.48 = 612.11/x
3. Step 3: Cross multiply
   1,077.89x = 1,487.48 × 612.11
4. Step 4: Simplify right side
   1,077.89x = 910,498.32
5. Step 5: Solve for x
   x = 910,498.32/1,077.89
6. Step 6: Final answer
   x = 844.70