Finding the Fourth Proportional to 76,300.87, 105,296.45 and 42,310.79

Step by Step Solution

1. Step 1: Write the proportion equation
   76,300.87 : 105,296.45 = 42,310.79 : x
2. Step 2: Convert to fraction form
   76,300.87/105,296.45 = 42,310.79/x
3. Step 3: Cross multiply
   76,300.87x = 105,296.45 × 42,310.79
4. Step 4: Simplify right side
   76,300.87x = 4,455,175,562.99
5. Step 5: Solve for x
   x = 4,455,175,562.99/76,300.87
6. Step 6: Final answer
   x = 58,389.58