Finding the Fourth Proportional to 42,990.14, 64,520.74 and 21,945.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,990.14 : 64,520.74 = 21,945.72 : x
2. Step 2: Convert to fraction form
   42,990.14/64,520.74 = 21,945.72/x
3. Step 3: Cross multiply
   42,990.14x = 64,520.74 × 21,945.72
4. Step 4: Simplify right side
   42,990.14x = 1,415,954,094.23
5. Step 5: Solve for x
   x = 1,415,954,094.23/42,990.14
6. Step 6: Final answer
   x = 32,936.72