Finding the Fourth Proportional to 78,510.40, 117,671.81 and 28,531.98

Step by Step Solution

1. Step 1: Write the proportion equation
   78,510.40 : 117,671.81 = 28,531.98 : x
2. Step 2: Convert to fraction form
   78,510.40/117,671.81 = 28,531.98/x
3. Step 3: Cross multiply
   78,510.40x = 117,671.81 × 28,531.98
4. Step 4: Simplify right side
   78,510.40x = 3,357,409,586.82
5. Step 5: Solve for x
   x = 3,357,409,586.82/78,510.40
6. Step 6: Final answer
   x = 42,763.88