Finding the Fourth Proportional to 77,908.10, 107,475.59 and 51,038.78

Step by Step Solution

1. Step 1: Write the proportion equation
   77,908.10 : 107,475.59 = 51,038.78 : x
2. Step 2: Convert to fraction form
   77,908.10/107,475.59 = 51,038.78/x
3. Step 3: Cross multiply
   77,908.10x = 107,475.59 × 51,038.78
4. Step 4: Simplify right side
   77,908.10x = 5,485,422,583.60
5. Step 5: Solve for x
   x = 5,485,422,583.60/77,908.10
6. Step 6: Final answer
   x = 70,408.89