Finding the Fourth Proportional to 1,142,845.50, 1,714,250.79 and 278,288.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142,845.50 : 1,714,250.79 = 278,288.51 : x
2. Step 2: Convert to fraction form
   1,142,845.50/1,714,250.79 = 278,288.51/x
3. Step 3: Cross multiply
   1,142,845.50x = 1,714,250.79 × 278,288.51
4. Step 4: Simplify right side
   1,142,845.50x = 477,056,299,186.83
5. Step 5: Solve for x
   x = 477,056,299,186.83/1,142,845.50
6. Step 6: Final answer
   x = 417,428.51