Finding the Fourth Proportional to 1,860.17, 2,789.90 and 561.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,860.17 : 2,789.90 = 561.34 : x
2. Step 2: Convert to fraction form
   1,860.17/2,789.90 = 561.34/x
3. Step 3: Cross multiply
   1,860.17x = 2,789.90 × 561.34
4. Step 4: Simplify right side
   1,860.17x = 1,566,065.71
5. Step 5: Solve for x
   x = 1,566,065.71/1,860.17
6. Step 6: Final answer
   x = 841.89