Finding the Fourth Proportional to 42,989.61, 64,484.89 and 13,004.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42,989.61 : 64,484.89 = 13,004.15 : x
2. Step 2: Convert to fraction form
   42,989.61/64,484.89 = 13,004.15/x
3. Step 3: Cross multiply
   42,989.61x = 64,484.89 × 13,004.15
4. Step 4: Simplify right side
   42,989.61x = 838,571,311.00
5. Step 5: Solve for x
   x = 838,571,311.00/42,989.61
6. Step 6: Final answer
   x = 19,506.37