Finding the Fourth Proportional to 1,355.82, 1,870.47 and 913.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.82 : 1,870.47 = 913.86 : x
2. Step 2: Convert to fraction form
   1,355.82/1,870.47 = 913.86/x
3. Step 3: Cross multiply
   1,355.82x = 1,870.47 × 913.86
4. Step 4: Simplify right side
   1,355.82x = 1,709,347.71
5. Step 5: Solve for x
   x = 1,709,347.71/1,355.82
6. Step 6: Final answer
   x = 1,260.75