Finding the Fourth Proportional to 877,987.86, 1,316,844.50 and 278,870.15

Step by Step Solution

1. Step 1: Write the proportion equation
   877,987.86 : 1,316,844.50 = 278,870.15 : x
2. Step 2: Convert to fraction form
   877,987.86/1,316,844.50 = 278,870.15/x
3. Step 3: Cross multiply
   877,987.86x = 1,316,844.50 × 278,870.15
4. Step 4: Simplify right side
   877,987.86x = 367,228,615,263.10
5. Step 5: Solve for x
   x = 367,228,615,263.10/877,987.86
6. Step 6: Final answer
   x = 418,261.61