Finding the Fourth Proportional to 52,742.78, 72,785.12 and 28,870.97

Step by Step Solution

1. Step 1: Write the proportion equation
   52,742.78 : 72,785.12 = 28,870.97 : x
2. Step 2: Convert to fraction form
   52,742.78/72,785.12 = 28,870.97/x
3. Step 3: Cross multiply
   52,742.78x = 72,785.12 × 28,870.97
4. Step 4: Simplify right side
   52,742.78x = 2,101,376,507.69
5. Step 5: Solve for x
   x = 2,101,376,507.69/52,742.78
6. Step 6: Final answer
   x = 39,841.98