Finding the Fourth Proportional to 37,978.86, 52,411.96 and 21,211.50

Step by Step Solution

1. Step 1: Write the proportion equation
   37,978.86 : 52,411.96 = 21,211.50 : x
2. Step 2: Convert to fraction form
   37,978.86/52,411.96 = 21,211.50/x
3. Step 3: Cross multiply
   37,978.86x = 52,411.96 × 21,211.50
4. Step 4: Simplify right side
   37,978.86x = 1,111,736,289.54
5. Step 5: Solve for x
   x = 1,111,736,289.54/37,978.86
6. Step 6: Final answer
   x = 29,272.50