Finding the Fourth Proportional to 65,990.71, 90,981.52 and 42,075.87

Step by Step Solution

1. Step 1: Write the proportion equation
   65,990.71 : 90,981.52 = 42,075.87 : x
2. Step 2: Convert to fraction form
   65,990.71/90,981.52 = 42,075.87/x
3. Step 3: Cross multiply
   65,990.71x = 90,981.52 × 42,075.87
4. Step 4: Simplify right side
   65,990.71x = 3,828,126,607.92
5. Step 5: Solve for x
   x = 3,828,126,607.92/65,990.71
6. Step 6: Final answer
   x = 58,010.08