Finding the Fourth Proportional to 42,970.31, 64,458.53 and 18,006.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,970.31 : 64,458.53 = 18,006.72 : x
2. Step 2: Convert to fraction form
   42,970.31/64,458.53 = 18,006.72/x
3. Step 3: Cross multiply
   42,970.31x = 64,458.53 × 18,006.72
4. Step 4: Simplify right side
   42,970.31x = 1,160,686,289.00
5. Step 5: Solve for x
   x = 1,160,686,289.00/42,970.31
6. Step 6: Final answer
   x = 27,011.35