Finding the Fourth Proportional to 1,346.61, 1,858.28 and 787.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,346.61 : 1,858.28 = 787.10 : x
2. Step 2: Convert to fraction form
   1,346.61/1,858.28 = 787.10/x
3. Step 3: Cross multiply
   1,346.61x = 1,858.28 × 787.10
4. Step 4: Simplify right side
   1,346.61x = 1,462,638.96
5. Step 5: Solve for x
   x = 1,462,638.96/1,346.61
6. Step 6: Final answer
   x = 1,086.16