Finding the Fourth Proportional to 272,382.72, 408,572.71 and 69,978.60

Step by Step Solution

1. Step 1: Write the proportion equation
   272,382.72 : 408,572.71 = 69,978.60 : x
2. Step 2: Convert to fraction form
   272,382.72/408,572.71 = 69,978.60/x
3. Step 3: Cross multiply
   272,382.72x = 408,572.71 × 69,978.60
4. Step 4: Simplify right side
   272,382.72x = 28,591,347,863.63
5. Step 5: Solve for x
   x = 28,591,347,863.63/272,382.72
6. Step 6: Final answer
   x = 104,967.55