Finding the Fourth Proportional to 139,932.99, 209,914.07 and 59,978.97

Step by Step Solution

1. Step 1: Write the proportion equation
   139,932.99 : 209,914.07 = 59,978.97 : x
2. Step 2: Convert to fraction form
   139,932.99/209,914.07 = 59,978.97/x
3. Step 3: Cross multiply
   139,932.99x = 209,914.07 × 59,978.97
4. Step 4: Simplify right side
   139,932.99x = 12,590,429,407.21
5. Step 5: Solve for x
   x = 12,590,429,407.21/139,932.99
6. Step 6: Final answer
   x = 89,974.70