Finding the Fourth Proportional to 1,238,864.76, 1,858,293.50 and 340,307.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238,864.76 : 1,858,293.50 = 340,307.42 : x
2. Step 2: Convert to fraction form
   1,238,864.76/1,858,293.50 = 340,307.42/x
3. Step 3: Cross multiply
   1,238,864.76x = 1,858,293.50 × 340,307.42
4. Step 4: Simplify right side
   1,238,864.76x = 632,391,055,594.77
5. Step 5: Solve for x
   x = 632,391,055,594.77/1,238,864.76
6. Step 6: Final answer
   x = 510,460.12