Finding the Fourth Proportional to 78,189, 107,900.21 and 42,378.09

Step by Step Solution

1. Step 1: Write the proportion equation
   78,189 : 107,900.21 = 42,378.09 : x
2. Step 2: Convert to fraction form
   78,189/107,900.21 = 42,378.09/x
3. Step 3: Cross multiply
   78,189x = 107,900.21 × 42,378.09
4. Step 4: Simplify right side
   78,189x = 4,572,604,598.51
5. Step 5: Solve for x
   x = 4,572,604,598.51/78,189
6. Step 6: Final answer
   x = 58,481.43