Finding the Fourth Proportional to 153,978.50, 212,490.97 and 83,322.50

Step by Step Solution

1. Step 1: Write the proportion equation
   153,978.50 : 212,490.97 = 83,322.50 : x
2. Step 2: Convert to fraction form
   153,978.50/212,490.97 = 83,322.50/x
3. Step 3: Cross multiply
   153,978.50x = 212,490.97 × 83,322.50
4. Step 4: Simplify right side
   153,978.50x = 17,705,278,847.83
5. Step 5: Solve for x
   x = 17,705,278,847.83/153,978.50
6. Step 6: Final answer
   x = 114,985.40