Finding the Fourth Proportional to 51,405.20, 70,931.67 and 30,191.30

Step by Step Solution

1. Step 1: Write the proportion equation
   51,405.20 : 70,931.67 = 30,191.30 : x
2. Step 2: Convert to fraction form
   51,405.20/70,931.67 = 30,191.30/x
3. Step 3: Cross multiply
   51,405.20x = 70,931.67 × 30,191.30
4. Step 4: Simplify right side
   51,405.20x = 2,141,519,328.47
5. Step 5: Solve for x
   x = 2,141,519,328.47/51,405.20
6. Step 6: Final answer
   x = 41,659.59