Finding the Fourth Proportional to 1,358, 1,873.46 and 1,042.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358 : 1,873.46 = 1,042.72 : x
2. Step 2: Convert to fraction form
   1,358/1,873.46 = 1,042.72/x
3. Step 3: Cross multiply
   1,358x = 1,873.46 × 1,042.72
4. Step 4: Simplify right side
   1,358x = 1,953,494.21
5. Step 5: Solve for x
   x = 1,953,494.21/1,358
6. Step 6: Final answer
   x = 1,438.51