Finding the Fourth Proportional to 909,128.58, 1,363,474.15 and 278,047.86

Step by Step Solution

1. Step 1: Write the proportion equation
   909,128.58 : 1,363,474.15 = 278,047.86 : x
2. Step 2: Convert to fraction form
   909,128.58/1,363,474.15 = 278,047.86/x
3. Step 3: Cross multiply
   909,128.58x = 1,363,474.15 × 278,047.86
4. Step 4: Simplify right side
   909,128.58x = 379,111,069,572.82
5. Step 5: Solve for x
   x = 379,111,069,572.82/909,128.58
6. Step 6: Final answer
   x = 417,004.90