Finding the Fourth Proportional to 78,189.07, 107,900.49 and 42,378.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,189.07 : 107,900.49 = 42,378.70 : x
2. Step 2: Convert to fraction form
   78,189.07/107,900.49 = 42,378.70/x
3. Step 3: Cross multiply
   78,189.07x = 107,900.49 × 42,378.70
4. Step 4: Simplify right side
   78,189.07x = 4,572,682,495.56
5. Step 5: Solve for x
   x = 4,572,682,495.56/78,189.07
6. Step 6: Final answer
   x = 58,482.37