Finding the Fourth Proportional to 1,385.12, 1,907.10 and 1,174.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.12 : 1,907.10 = 1,174.86 : x
2. Step 2: Convert to fraction form
   1,385.12/1,907.10 = 1,174.86/x
3. Step 3: Cross multiply
   1,385.12x = 1,907.10 × 1,174.86
4. Step 4: Simplify right side
   1,385.12x = 2,240,575.51
5. Step 5: Solve for x
   x = 2,240,575.51/1,385.12
6. Step 6: Final answer
   x = 1,617.60