Finding the Fourth Proportional to 76,300.48, 105,295.91 and 42,310.40

Step by Step Solution

1. Step 1: Write the proportion equation
   76,300.48 : 105,295.91 = 42,310.40 : x
2. Step 2: Convert to fraction form
   76,300.48/105,295.91 = 42,310.40/x
3. Step 3: Cross multiply
   76,300.48x = 105,295.91 × 42,310.40
4. Step 4: Simplify right side
   76,300.48x = 4,455,112,122.15
5. Step 5: Solve for x
   x = 4,455,112,122.15/76,300.48
6. Step 6: Final answer
   x = 58,389.05