Finding the Fourth Proportional to 98,847.78, 136,419.72 and 56,412.69

Step by Step Solution

1. Step 1: Write the proportion equation
   98,847.78 : 136,419.72 = 56,412.69 : x
2. Step 2: Convert to fraction form
   98,847.78/136,419.72 = 56,412.69/x
3. Step 3: Cross multiply
   98,847.78x = 136,419.72 × 56,412.69
4. Step 4: Simplify right side
   98,847.78x = 7,695,803,374.25
5. Step 5: Solve for x
   x = 7,695,803,374.25/98,847.78
6. Step 6: Final answer
   x = 77,855.10