Finding the Fourth Proportional to 42,970.56, 64,443.36 and 18,009.93

Step by Step Solution

1. Step 1: Write the proportion equation
   42,970.56 : 64,443.36 = 18,009.93 : x
2. Step 2: Convert to fraction form
   42,970.56/64,443.36 = 18,009.93/x
3. Step 3: Cross multiply
   42,970.56x = 64,443.36 × 18,009.93
4. Step 4: Simplify right side
   42,970.56x = 1,160,620,402.56
5. Step 5: Solve for x
   x = 1,160,620,402.56/42,970.56
6. Step 6: Final answer
   x = 27,009.66