Finding the Fourth Proportional to 1,653.17, 2,478.54 and 788.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,653.17 : 2,478.54 = 788.09 : x
2. Step 2: Convert to fraction form
   1,653.17/2,478.54 = 788.09/x
3. Step 3: Cross multiply
   1,653.17x = 2,478.54 × 788.09
4. Step 4: Simplify right side
   1,653.17x = 1,953,312.59
5. Step 5: Solve for x
   x = 1,953,312.59/1,653.17
6. Step 6: Final answer
   x = 1,181.56