Finding the Fourth Proportional to 77,984.31, 107,568.81 and 51,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   77,984.31 : 107,568.81 = 51,128.56 : x
2. Step 2: Convert to fraction form
   77,984.31/107,568.81 = 51,128.56/x
3. Step 3: Cross multiply
   77,984.31x = 107,568.81 × 51,128.56
4. Step 4: Simplify right side
   77,984.31x = 5,499,838,490.67
5. Step 5: Solve for x
   x = 5,499,838,490.67/77,984.31
6. Step 6: Final answer
   x = 70,524.93