Finding the Fourth Proportional to 78,188.28, 107,946.06 and 51,377.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,188.28 : 107,946.06 = 51,377.72 : x
2. Step 2: Convert to fraction form
   78,188.28/107,946.06 = 51,377.72/x
3. Step 3: Cross multiply
   78,188.28x = 107,946.06 × 51,377.72
4. Step 4: Simplify right side
   78,188.28x = 5,546,022,445.78
5. Step 5: Solve for x
   x = 5,546,022,445.78/78,188.28
6. Step 6: Final answer
   x = 70,931.63