Finding the Fourth Proportional to 51,410.78, 70,948.80 and 28,749.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51,410.78 : 70,948.80 = 28,749.72 : x
2. Step 2: Convert to fraction form
   51,410.78/70,948.80 = 28,749.72/x
3. Step 3: Cross multiply
   51,410.78x = 70,948.80 × 28,749.72
4. Step 4: Simplify right side
   51,410.78x = 2,039,758,082.17
5. Step 5: Solve for x
   x = 2,039,758,082.17/51,410.78
6. Step 6: Final answer
   x = 39,675.69