Finding the Fourth Proportional to 52,156.56, 78,234.03 and 20,991

Step by Step Solution

1. Step 1: Write the proportion equation
   52,156.56 : 78,234.03 = 20,991 : x
2. Step 2: Convert to fraction form
   52,156.56/78,234.03 = 20,991/x
3. Step 3: Cross multiply
   52,156.56x = 78,234.03 × 20,991
4. Step 4: Simplify right side
   52,156.56x = 1,642,210,523.73
5. Step 5: Solve for x
   x = 1,642,210,523.73/52,156.56
6. Step 6: Final answer
   x = 31,486.17