Finding the Fourth Proportional to 52,475.99, 78,721.89 and 18,739.40

Step by Step Solution

1. Step 1: Write the proportion equation
   52,475.99 : 78,721.89 = 18,739.40 : x
2. Step 2: Convert to fraction form
   52,475.99/78,721.89 = 18,739.40/x
3. Step 3: Cross multiply
   52,475.99x = 78,721.89 × 18,739.40
4. Step 4: Simplify right side
   52,475.99x = 1,475,200,591.86
5. Step 5: Solve for x
   x = 1,475,200,591.86/52,475.99
6. Step 6: Final answer
   x = 28,111.91