Finding the Fourth Proportional to 37,602, 56,411.64 and 12,978

Step by Step Solution

1. Step 1: Write the proportion equation
   37,602 : 56,411.64 = 12,978 : x
2. Step 2: Convert to fraction form
   37,602/56,411.64 = 12,978/x
3. Step 3: Cross multiply
   37,602x = 56,411.64 × 12,978
4. Step 4: Simplify right side
   37,602x = 732,110,263.92
5. Step 5: Solve for x
   x = 732,110,263.92/37,602
6. Step 6: Final answer
   x = 19,469.98