Finding the Fourth Proportional to 78,190.63, 107,902.45 and 42,379.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,190.63 : 107,902.45 = 42,379.72 : x
2. Step 2: Convert to fraction form
   78,190.63/107,902.45 = 42,379.72/x
3. Step 3: Cross multiply
   78,190.63x = 107,902.45 × 42,379.72
4. Step 4: Simplify right side
   78,190.63x = 4,572,875,618.31
5. Step 5: Solve for x
   x = 4,572,875,618.31/78,190.63
6. Step 6: Final answer
   x = 58,483.68