Finding the Fourth Proportional to 1,355.58, 1,870.58 and 1,001.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.58 : 1,870.58 = 1,001.72 : x
2. Step 2: Convert to fraction form
   1,355.58/1,870.58 = 1,001.72/x
3. Step 3: Cross multiply
   1,355.58x = 1,870.58 × 1,001.72
4. Step 4: Simplify right side
   1,355.58x = 1,873,783.04
5. Step 5: Solve for x
   x = 1,873,783.04/1,355.58
6. Step 6: Final answer
   x = 1,382.27