Finding the Fourth Proportional to 76,490.76, 105,556.55 and 42,499.32

Step by Step Solution

1. Step 1: Write the proportion equation
   76,490.76 : 105,556.55 = 42,499.32 : x
2. Step 2: Convert to fraction form
   76,490.76/105,556.55 = 42,499.32/x
3. Step 3: Cross multiply
   76,490.76x = 105,556.55 × 42,499.32
4. Step 4: Simplify right side
   76,490.76x = 4,486,081,384.05
5. Step 5: Solve for x
   x = 4,486,081,384.05/76,490.76
6. Step 6: Final answer
   x = 58,648.67