Finding the Fourth Proportional to 77,389.50, 116,091 and 21,985.50

Step by Step Solution

1. Step 1: Write the proportion equation
   77,389.50 : 116,091 = 21,985.50 : x
2. Step 2: Convert to fraction form
   77,389.50/116,091 = 21,985.50/x
3. Step 3: Cross multiply
   77,389.50x = 116,091 × 21,985.50
4. Step 4: Simplify right side
   77,389.50x = 2,552,318,680.50
5. Step 5: Solve for x
   x = 2,552,318,680.50/77,389.50
6. Step 6: Final answer
   x = 32,980.17