Finding the Fourth Proportional to 309,777.33, 464,479.05 and 138,967.91

Step by Step Solution

1. Step 1: Write the proportion equation
   309,777.33 : 464,479.05 = 138,967.91 : x
2. Step 2: Convert to fraction form
   309,777.33/464,479.05 = 138,967.91/x
3. Step 3: Cross multiply
   309,777.33x = 464,479.05 × 138,967.91
4. Step 4: Simplify right side
   309,777.33x = 64,547,680,494.89
5. Step 5: Solve for x
   x = 64,547,680,494.89/309,777.33
6. Step 6: Final answer
   x = 208,367.99