Finding the Fourth Proportional to 1,858.10, 2,564.18 and 1,018.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.10 : 2,564.18 = 1,018.81 : x
2. Step 2: Convert to fraction form
   1,858.10/2,564.18 = 1,018.81/x
3. Step 3: Cross multiply
   1,858.10x = 2,564.18 × 1,018.81
4. Step 4: Simplify right side
   1,858.10x = 2,612,412.23
5. Step 5: Solve for x
   x = 2,612,412.23/1,858.10
6. Step 6: Final answer
   x = 1,405.96