Finding the Fourth Proportional to 42,737.81, 64,106.85 and 13,155.45

Step by Step Solution

1. Step 1: Write the proportion equation
   42,737.81 : 64,106.85 = 13,155.45 : x
2. Step 2: Convert to fraction form
   42,737.81/64,106.85 = 13,155.45/x
3. Step 3: Cross multiply
   42,737.81x = 64,106.85 × 13,155.45
4. Step 4: Simplify right side
   42,737.81x = 843,354,459.83
5. Step 5: Solve for x
   x = 843,354,459.83/42,737.81
6. Step 6: Final answer
   x = 19,733.22