Finding the Fourth Proportional to 123,987.93, 185,802.40 and 85,479.91

Step by Step Solution

1. Step 1: Write the proportion equation
   123,987.93 : 185,802.40 = 85,479.91 : x
2. Step 2: Convert to fraction form
   123,987.93/185,802.40 = 85,479.91/x
3. Step 3: Cross multiply
   123,987.93x = 185,802.40 × 85,479.91
4. Step 4: Simplify right side
   123,987.93x = 15,882,372,429.78
5. Step 5: Solve for x
   x = 15,882,372,429.78/123,987.93
6. Step 6: Final answer
   x = 128,096.12