Finding the Fourth Proportional to 42,991.13, 64,522.23 and 21,946.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,991.13 : 64,522.23 = 21,946.72 : x
2. Step 2: Convert to fraction form
   42,991.13/64,522.23 = 21,946.72/x
3. Step 3: Cross multiply
   42,991.13x = 64,522.23 × 21,946.72
4. Step 4: Simplify right side
   42,991.13x = 1,416,051,315.59
5. Step 5: Solve for x
   x = 1,416,051,315.59/42,991.13
6. Step 6: Final answer
   x = 32,938.22