Finding the Fourth Proportional to 407,962.47, 611,943.59 and 127,479.72

Step by Step Solution

1. Step 1: Write the proportion equation
   407,962.47 : 611,943.59 = 127,479.72 : x
2. Step 2: Convert to fraction form
   407,962.47/611,943.59 = 127,479.72/x
3. Step 3: Cross multiply
   407,962.47x = 611,943.59 × 127,479.72
4. Step 4: Simplify right side
   407,962.47x = 78,010,397,827.69
5. Step 5: Solve for x
   x = 78,010,397,827.69/407,962.47
6. Step 6: Final answer
   x = 191,219.54