Finding the Fourth Proportional to 140,155.86, 210,108.78 and 51,388.68

Step by Step Solution

1. Step 1: Write the proportion equation
   140,155.86 : 210,108.78 = 51,388.68 : x
2. Step 2: Convert to fraction form
   140,155.86/210,108.78 = 51,388.68/x
3. Step 3: Cross multiply
   140,155.86x = 210,108.78 × 51,388.68
4. Step 4: Simplify right side
   140,155.86x = 10,797,212,860.61
5. Step 5: Solve for x
   x = 10,797,212,860.61/140,155.86
6. Step 6: Final answer
   x = 77,037.18