Finding the Fourth Proportional to 78,037.21, 107,702.63 and 51,219.73

Step by Step Solution

1. Step 1: Write the proportion equation
   78,037.21 : 107,702.63 = 51,219.73 : x
2. Step 2: Convert to fraction form
   78,037.21/107,702.63 = 51,219.73/x
3. Step 3: Cross multiply
   78,037.21x = 107,702.63 × 51,219.73
4. Step 4: Simplify right side
   78,037.21x = 5,516,499,628.89
5. Step 5: Solve for x
   x = 5,516,499,628.89/78,037.21
6. Step 6: Final answer
   x = 70,690.63