Finding the Fourth Proportional to 46,978.62, 64,830.70 and 28,115.76

Step by Step Solution

1. Step 1: Write the proportion equation
   46,978.62 : 64,830.70 = 28,115.76 : x
2. Step 2: Convert to fraction form
   46,978.62/64,830.70 = 28,115.76/x
3. Step 3: Cross multiply
   46,978.62x = 64,830.70 × 28,115.76
4. Step 4: Simplify right side
   46,978.62x = 1,822,764,401.83
5. Step 5: Solve for x
   x = 1,822,764,401.83/46,978.62
6. Step 6: Final answer
   x = 38,799.87