Finding the Fourth Proportional to 78,190.91, 107,903.64 and 42,380.88

Step by Step Solution

1. Step 1: Write the proportion equation
   78,190.91 : 107,903.64 = 42,380.88 : x
2. Step 2: Convert to fraction form
   78,190.91/107,903.64 = 42,380.88/x
3. Step 3: Cross multiply
   78,190.91x = 107,903.64 × 42,380.88
4. Step 4: Simplify right side
   78,190.91x = 4,573,051,218.40
5. Step 5: Solve for x
   x = 4,573,051,218.40/78,190.91
6. Step 6: Final answer
   x = 58,485.72