Finding the Fourth Proportional to 1,390.01, 1,917.59 and 892.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.01 : 1,917.59 = 892.49 : x
2. Step 2: Convert to fraction form
   1,390.01/1,917.59 = 892.49/x
3. Step 3: Cross multiply
   1,390.01x = 1,917.59 × 892.49
4. Step 4: Simplify right side
   1,390.01x = 1,711,415.85
5. Step 5: Solve for x
   x = 1,711,415.85/1,390.01
6. Step 6: Final answer
   x = 1,231.23