Finding the Fourth Proportional to 140,307.30, 210,315.15 and 77,030.10

Step by Step Solution

1. Step 1: Write the proportion equation
   140,307.30 : 210,315.15 = 77,030.10 : x
2. Step 2: Convert to fraction form
   140,307.30/210,315.15 = 77,030.10/x
3. Step 3: Cross multiply
   140,307.30x = 210,315.15 × 77,030.10
4. Step 4: Simplify right side
   140,307.30x = 16,200,597,036.02
5. Step 5: Solve for x
   x = 16,200,597,036.02/140,307.30
6. Step 6: Final answer
   x = 115,465.10