Finding the Fourth Proportional to 479,769, 662,139.54 and 278,565

Step by Step Solution

1. Step 1: Write the proportion equation
   479,769 : 662,139.54 = 278,565 : x
2. Step 2: Convert to fraction form
   479,769/662,139.54 = 278,565/x
3. Step 3: Cross multiply
   479,769x = 662,139.54 × 278,565
4. Step 4: Simplify right side
   479,769x = 184,448,900,960.10
5. Step 5: Solve for x
   x = 184,448,900,960.10/479,769
6. Step 6: Final answer
   x = 384,453.56