Finding the Fourth Proportional to 76,281.40, 105,274.54 and 42,300.54

Step by Step Solution

1. Step 1: Write the proportion equation
   76,281.40 : 105,274.54 = 42,300.54 : x
2. Step 2: Convert to fraction form
   76,281.40/105,274.54 = 42,300.54/x
3. Step 3: Cross multiply
   76,281.40x = 105,274.54 × 42,300.54
4. Step 4: Simplify right side
   76,281.40x = 4,453,169,890.25
5. Step 5: Solve for x
   x = 4,453,169,890.25/76,281.40
6. Step 6: Final answer
   x = 58,378.19