Finding the Fourth Proportional to 37,155.60, 51,274.72 and 21,240.40

Step by Step Solution

1. Step 1: Write the proportion equation
   37,155.60 : 51,274.72 = 21,240.40 : x
2. Step 2: Convert to fraction form
   37,155.60/51,274.72 = 21,240.40/x
3. Step 3: Cross multiply
   37,155.60x = 51,274.72 × 21,240.40
4. Step 4: Simplify right side
   37,155.60x = 1,089,095,562.69
5. Step 5: Solve for x
   x = 1,089,095,562.69/37,155.60
6. Step 6: Final answer
   x = 29,311.75