Finding the Fourth Proportional to 76,321.16, 105,323.46 and 42,785

Step by Step Solution

1. Step 1: Write the proportion equation
   76,321.16 : 105,323.46 = 42,785 : x
2. Step 2: Convert to fraction form
   76,321.16/105,323.46 = 42,785/x
3. Step 3: Cross multiply
   76,321.16x = 105,323.46 × 42,785
4. Step 4: Simplify right side
   76,321.16x = 4,506,264,236.10
5. Step 5: Solve for x
   x = 4,506,264,236.10/76,321.16
6. Step 6: Final answer
   x = 59,043.45