Finding the Fourth Proportional to 42,683.90, 63,870.90 and 30,861.35

Step by Step Solution

1. Step 1: Write the proportion equation
   42,683.90 : 63,870.90 = 30,861.35 : x
2. Step 2: Convert to fraction form
   42,683.90/63,870.90 = 30,861.35/x
3. Step 3: Cross multiply
   42,683.90x = 63,870.90 × 30,861.35
4. Step 4: Simplify right side
   42,683.90x = 1,971,141,880.36
5. Step 5: Solve for x
   x = 1,971,141,880.36/42,683.90
6. Step 6: Final answer
   x = 46,179.99