Finding the Fourth Proportional to 65,989.71, 90,980.15 and 42,074.87

Step by Step Solution

1. Step 1: Write the proportion equation
   65,989.71 : 90,980.15 = 42,074.87 : x
2. Step 2: Convert to fraction form
   65,989.71/90,980.15 = 42,074.87/x
3. Step 3: Cross multiply
   65,989.71x = 90,980.15 × 42,074.87
4. Step 4: Simplify right side
   65,989.71x = 3,827,977,318.56
5. Step 5: Solve for x
   x = 3,827,977,318.56/65,989.71
6. Step 6: Final answer
   x = 58,008.70