Finding the Fourth Proportional to 1,320.00, 1,821.81 and 788.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.00 : 1,821.81 = 788.91 : x
2. Step 2: Convert to fraction form
   1,320.00/1,821.81 = 788.91/x
3. Step 3: Cross multiply
   1,320.00x = 1,821.81 × 788.91
4. Step 4: Simplify right side
   1,320.00x = 1,437,235.82
5. Step 5: Solve for x
   x = 1,437,235.82/1,320.00
6. Step 6: Final answer
   x = 1,088.82