Finding the Fourth Proportional to 52,212.24, 72,071.60 and 30,991.50

Step by Step Solution

1. Step 1: Write the proportion equation
   52,212.24 : 72,071.60 = 30,991.50 : x
2. Step 2: Convert to fraction form
   52,212.24/72,071.60 = 30,991.50/x
3. Step 3: Cross multiply
   52,212.24x = 72,071.60 × 30,991.50
4. Step 4: Simplify right side
   52,212.24x = 2,233,606,836.44
5. Step 5: Solve for x
   x = 2,233,606,836.44/52,212.24
6. Step 6: Final answer
   x = 42,779.37