Finding the Fourth Proportional to 91,916.06, 137,990.75 and 78,152.54

Step by Step Solution

1. Step 1: Write the proportion equation
   91,916.06 : 137,990.75 = 78,152.54 : x
2. Step 2: Convert to fraction form
   91,916.06/137,990.75 = 78,152.54/x
3. Step 3: Cross multiply
   91,916.06x = 137,990.75 × 78,152.54
4. Step 4: Simplify right side
   91,916.06x = 10,784,326,528.29
5. Step 5: Solve for x
   x = 10,784,326,528.29/91,916.06
6. Step 6: Final answer
   x = 117,328.00